Other half held grouchypants in the evenings (read - 10pm to 2am) so I could sleep, or I would have been totally non-functioning. He slept in very late in the mornings when grouchypants was asleep. We stayed in mutual barely-there zombie mode for about a year. We even accidentally bought a house during zombie phase, and of course it took absolutely forever to renovate the thing so we could live in it ...

I suppose one 'advantage' of extreme sleep deprivation is that when you *do* have the chance to sleep, you go to sleep instantly. Where by 'chance' I mean simple stuff, like when your eyes close to blink, when you sit on any surface that is slightly comfortable, during breastfeeding, when stopped at traffic lights ....